A cantilever parasol monoplane with a plywood-skinned
wooden wing and a steel-tube fuselage, the D
X single-seat fighter had begun life in Germany as the V
41. The partly-completed prototype was taken to the
Netherlands, where, in 1921, it was completed with a
300hp Hispano-Suiza 8Fb eight-cylinder water-cooled
engine in place of the 185hp BMW Ilia six-cylinder
engine for which it had been originally intended. The
prototype crashed as a result of wing flutter during a
demonstration in Spain in 1922. Nevertheless, an order
for 10 D X fighters was placed on behalf of the Aeronautica
Militar Espanola, these being supplied during
the course of 1923. In the same year, one example of the
D X was supplied to Finland. Armament comprised two
7.92mm machine guns.